JP2009284648A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine that achieves superior vibration resistance and cooling performance without changing the shape of a laminated core and enables the miniaturization (reduction in layer thickness) of a lead portion. <P>SOLUTION: The rotary electric machine includes a bowl-shaped flywheel having a plurality of magnets arranged on its inner peripheral surface and is rotated around a central shaft, a fixed core 2 which is so formed that the outer peripheral surfaces of a plurality of radially projecting magnetic poles 21 arranged on the inner peripheral side of the flywheel face the magnets, a plurality of coils 3 that are wound around the magnetic poles 21, respectively, and an annual connection holder 4 which is disposed to be radially closer to the center than the coils 3 on one end face of the fixed core 2 in the direction of the central shaft and carries out interconnection of respective wind-start wires 3a and wind-end wires 3b of the coils 3 and connection of an output lead wire. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine that can be preferably used, for example, as a magnet generator that generates power by electromagnetic induction between a magnet that rotates by rotation of a flywheel and an armature winding. It is about improvement.

  As a conventional magnet generator, out of a pair of lead wires of the first phase, the second phase and the third phase of the power generation coil drawn in the axial direction at intervals in the circumferential direction, the lead wire of the second phase, The third-phase lead wire is covered with the first protective tube, and the second-phase lead wire and the third-phase lead wire covered with the first protective tube are the first-phase lead wires. The first-phase lead wire, the second-phase lead wire, and the third-phase lead wire are bent in the circumferential direction toward the wire and bundled together with the first-phase lead wire. Some are bent on the opposite side of the circumferential direction (see, for example, Patent Document 1).

JP 2007-166752 A (first page, FIGS. 1 to 2)

  In a magnet generator, a stator with Y (star) connection specifications is mainly used to secure output in the low rotation range, and a stator with △ (delta) connection specifications is mainly used to suppress output in the high rotation range. Since it is used, the winding conditions and the connection method differ depending on the connection specifications, and a plurality of sub-ASSYs corresponding to the number of models corresponding to the state after winding are required. Further, since there are two specifications of right out / left out in the direction of drawing out the output lead wire, the line adjustment processing corresponding to that is required. Furthermore, since the wire-straightening process is performed on the wound magnetic pole part, the surrounding area is heated and the cooling performance is significantly inhibited. In recent years, since there is a demand for high output and miniaturization of a magnet generator, it is necessary to reduce the layer even in the structure of the lead portion. Although the conventional magnet generator as described in Patent Document 1 has the effect of reducing the number of parts, it has been difficult to solve the above problems.

  The present invention has been made to solve the above-described problems of the prior art, and without changing the shape of the stator core, it is excellent in vibration resistance and cooling properties, and the lead-out portion is downsized (lower layer). The object is to provide a rotating electrical machine to obtain.

  The rotating electrical machine according to the present invention is provided with a plurality of magnets on the inner peripheral surface, and is provided so as to oppose the inner peripheral surface of the flywheel and a bowl-shaped flywheel that rotates around the central axis. A stator core having a plurality of radially projecting magnetic poles, a plurality of coils wound around the magnetic poles, and a radially inner side than the coils on one end surface of the stator core in the central axis direction And an annular connection holder for connecting the winding start lines and the winding end lines of the plurality of coils and connecting the output lead wires.

  In this invention, an annular connection holder for connecting each winding start line and each winding end line of the coil and connecting the output lead wire is provided on the radially inner side of the coil on one end surface in the central axis direction of the stator core. By performing the connection process on the connection holder, it is excellent in vibration resistance and cooling properties without changing the shape of the stator core, and the lead portion can be reduced in size (lower layer).

Embodiment 1 FIG.
1 and 2 are views conceptually showing a main part of a magnet generator as a rotary electric machine according to Embodiment 1 of the present invention. FIG. 1 is a longitudinal sectional view of a stator, and FIG. It is a front view which shows the shown stator. In addition, the same code | symbol is attached | subjected and demonstrated through each figure about the same or an equivalent part. In the figure, a stator 1 of a magnet generator has a plurality of magnetic poles 21 projecting radially, a laminated stator core 2 having mounting holes 2a, and a plurality of coils wound around the magnetic poles 21, respectively. The coil (power generation coil) 3 and the coil 3 on one end surface (the right end surface in FIG. 1) of the stator core 2 in the direction of the central axis O are disposed radially inward, and each winding start line 3a of the plurality of coils 3 and An annular connection holder 4 for connecting each winding end wire 3b and connecting an output lead wire (not shown), and a mounting bolt 5 for fixing the connection holder 4 to the stator core 2 are provided.

  The connection holder 4 is formed in an annular shape, and is provided with insertion holes 41a for the mounting bolts 5 at a plurality of locations in the circumferential direction, and a base member 41 in which a peripheral portion of the insertion holes 41a serves as a seating surface portion of the mounting bolts 5; The windings 3a and 3b are fixed to the material 41 via an insulating material 42 and connected to the coil 3 or the magnetic pole 2 to connect the winding start wires 3a and winding end wires 3b by welding, caulking or the like, for example. And a plurality of terminal conductors 44 (44a, 44b, 44b) that electrically connect the plurality of connection terminal portions 43 in the circumferential direction so as to perform a three-phase delta connection in this example. 44c), and the dimension in the direction of the central axis O from the end face of the stator core 2 is substantially equal to or smaller than the thickness W of the coil 3 as shown in FIG. As shown in FIG. 2, the terminal conductor 44 is separated from the radially inner peripheral side in a concentric circular arc shape such as the first phase (44a), the second phase (44b), and the third phase (44c). In addition, the mounting bolt 5 is formed so as to escape from the outside in the radial direction.

  Further, the connection terminal portion 43 protrudes in the direction of the central axis O in order to facilitate connection with the winding start line 3a or the winding end line 3b or with an output lead wire (not shown). The output lead wire is drawn out in a desired direction according to the specification from a desired connection terminal portion 43 corresponding to the first phase to the third phase. Further, a plurality of magnets are provided on the inner peripheral surface constituting the magnet generator, and power transmission is performed by rotating the flywheel by a driving source such as a saddle-shaped flywheel or an internal combustion engine that rotates around the central axis O. Other configurations such as a mechanism and a diode that rectifies the AC power induced in the coil 3 into a direct current can be appropriately selected and used, for example, as well as a conventionally known technique as disclosed in Patent Document 1 above. Since it is a part, illustration and detailed description are omitted.

  Next, the operation will be described. When a flywheel (not shown) is driven to rotate by an internal combustion engine (not shown), the magnetic flux generated by the magnet provided on the flywheel acts on the magnetic pole 21 of the stator 1 as an alternating magnetic field. A voltage is induced in the rotated coil 3, and in the example of FIG. 2, it is output as three-phase alternating current power, both of which are not shown in the figure, via output lead wires and rectifier diodes to loads such as batteries and other various electrical components. Supplied.

  On the other hand, the lead-out portion of the output lead wire including the straightening process, which is a characteristic part of the present invention, uses a space radially inward from the inner end portion 3i of the coil 3 at one end surface of the stator core 2 in the central axis O direction. And, it is configured by using an annular connection holder 4 that is directly attached to the stator core 2, and each winding start line 3a and each winding end line 3b of the plurality of coils 3 is connected, and output lead wires are connected. This is done by the annular connection holder 4. Specifically, the winding start line 3 a and the winding end line 3 b of the coil 3 drawn out from the magnetic pole 21 are connected to the connection terminal portion 43 on the connection holder 4, and the output lead wire is also selected from the plurality of connection terminal portions 43. Is connected to

  In such a configuration, since a substantially flat surface structure is formed, the dimension in the central axis O direction of the connection holder 4 including the plurality of arc-shaped terminal conductors 44 is formed to be smaller than the thickness W of the coil 3, and the conventional output lead wire Since a metal clamp for holding the sheet is not necessary, the protrusion is eliminated. Further, since the conventional stator core 2 can be used as it is, it is not necessary to change the shape. Further, the connection holder 4 is directly fixed to the stator core 2 by the mounting bolts 5, and the base material 41, the insulating material 42, the connection terminal portion 43, and the terminal conductor 44 constituting the connection holder 4 are integrated. It has vibration resistance, and since each member is dispersed in the surface direction in the annular portion, heat dissipation and cooling properties are ensured.

  As described above, in the first embodiment, the winding start wire 3a and the winding end wire 3b drawn from each magnetic pole 21 portion are connected to the terminal conductor 44a on the annular connection holder 4 formed according to the connection specifications. 44b and 44c. Conventionally, the lead-out portion that has been straightened on the coil end is connected on the connection holder 4, which is radially inward of the insulation range of the coil 3 and separate from the stator core 2. There is a sufficient gap in the lined magnetic pole 21 part, and heat does not generate. In addition, based on the manufacturing status of various multi-models, which has been a problem in advance, a plurality of terminal shapes formed according to the connection specifications (delta connection, star connection), for example, based on the sub-assy of the basic specification. By preparing the connection holder, it is possible to easily cope with conventional variations, and in the method of connection with the output lead wire (distribution harness), the connection terminal portion 43 on the connection holder 4 is directly taken out from any place. It can be pulled out in any direction of 360 degrees by using a connector terminal.

  As described above, according to the first embodiment, the rotating electrical machine that is excellent in vibration resistance and cooling performance without changing the shape of the laminated stator cores 2 and that can reduce the size (lower layer) of the lead portion. Obtainable. For this reason, durability can also be improved and lifetime improvement of a product can be aimed at. Moreover, there is no restriction | limiting in the drawing direction of an output lead wire, A free direction can be selected according to a specification. Further, by providing a separate through hole in the laminated stator core 2, the output lead wire can be pulled out from the opposite surface. As described above, a plurality of wire-drawing processes and an output lead-out direction (angle) can be realized from the winding specifications. In addition, for example, when a withstand voltage failure between the coils 3 or between the coil 3 and the stator core 2 occurs, the conventional structure treats it as a defective product. Since it is possible to rewind only the winding, productivity is also improved.

  Furthermore, since the annular connection holder 4 is fixed to the stator core 2 directly with the mounting bolt 5 at the inner side in the radial direction from the coil 3 at the same time as the stator core 2, the rigidity and vibration resistance are higher than those of conventional products. Sex can be secured. In recent years, coils for rotating electrical machines have become thicker and more densely wound, and the space for installing the lead structure (straightening process) has been reduced. However, according to the first embodiment, FIG. As shown in FIG. 4, since it is provided in the surface direction that extends in the radial direction, it can be realized without causing a problem of the space for the line adjustment process. In addition, in the said structure, since all the winding start wires 3a and each winding end wire 3b of each coil 3 are connected to the connection terminal part 43, although the connection man-hour increases, the attachment hole 2a of the stator core 2 and Since the angle reference can be set by making the insertion holes 41a of the connection holder 4 coincide with each other, it is easy to automate the wire-straightening process and the connection work by the robot, and the production capacity can be equal to or higher than the conventional one.

Embodiment 2. FIG.
FIG. 3 is a longitudinal sectional view showing a stator which is a main part of a magnet generator as a rotating electrical machine according to Embodiment 2 of the present invention. In the second embodiment, in order to reduce the weight of the stator 1A, the central portion in the radial direction is thinner than the magnetic pole of the stator core 2A with respect to the axial direction O (a step is set). Since other configurations are substantially the same as those in the first embodiment, description thereof is omitted.
In this second embodiment, the annular connection holder 4 is installed at a low stepped portion formed by thinning by such a configuration, so that the straightening processing (leading structure) portion can be further shortened in the axial direction, At the same time, the head of the mounting bolt 5 can be lowered, so that a small magnet generator with a further shortened dimension in the direction of the central axis O can be obtained.

  In the first and second embodiments, the case where the connection on the connection holder 4 is the delta connection has been described. However, the same effect can be expected even in the case of the star connection. Moreover, although the case where this invention was applied to the magnet generator was demonstrated, it may be an electric motor, a motor generator, etc., for example. Furthermore, it goes without saying that the invention is not limited to vehicles.

It is a longitudinal cross-sectional view which shows notionally the stator of the magnet generator as a rotary electric machine which concerns on Embodiment 1 of this invention. It is a front view which shows the stator shown by FIG. It is a longitudinal cross-sectional view which shows the stator which is the principal part of the magnet generator as a rotary electric machine which concerns on Embodiment 2 of this invention.

Explanation of symbols

  1, 1A stator, 2, 2A stator core, 2a mounting hole, 21 magnetic pole, 3 coil, 3a winding start line, 3b winding end line, 3i inner end, 4 connection holder, 41 base material, 41a insertion hole, 42 Insulating material, 43 Connection terminal part, 44 (44a, 44b, 44c) Terminal conductor, 5 Mounting bolt, O Center axis.

Claims (4)

  A plurality of magnets are provided on the inner peripheral surface, and a bowl-shaped flywheel rotated around the central axis, and a plurality of radially projecting magnetic poles provided to face the inner peripheral surface of the flywheel A plurality of coils wound around the magnetic poles, and each winding start of the plurality of coils provided radially inward of the one end surface in the central axis direction of the stator core. An electric rotating machine comprising: a connection holder for connecting a wire and each winding end wire and connecting an output lead wire.   The connection holder includes a plurality of connection terminal portions provided in a circumferential direction for connecting each winding start line and each winding end line of the plurality of coils, and the plurality of connection terminals so as to perform three-phase delta connection or star connection. The rotating electrical machine according to claim 1, further comprising a plurality of terminal conductors that electrically connect the connection terminal portions in the circumferential direction.   3. The rotating electrical machine according to claim 1, wherein a dimension of the connection holder in the central axis direction is thinner than a thickness of the coil.   The rotating electrical machine according to any one of claims 1 to 3, wherein the stator core has a radially inner portion thinner than the magnetic pole in a central axis direction.

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